Cyclohexyl compound and process of making the same



Patented Feb. 26, 1929.

PATENT OFFICE.

UNITED STATES ROGER ADAMS, OF UBBANA, ILLINOIS, ASBIGNOB TO ABBOTT LABORATORIES, OF NORTH CHICAGO, ILLINOIS, A CORPORATION 01 ILLINOIS.

CYCLOHEXYL COMPOUND AND PROCESS OF MAKING THE SAME.

No Drawing.

This invention relates to the preparation of acids and derivatives of the following general structure:

H10 CH! wherein y is zero or more and where R represents an aliphatic hydrocarbon group, for example, alkyl or alkylene, and Z represents hydrogen, a metal, or an alkyl group.

These acids are found to be bactericidal against acid-fast bacteria such as B. Leprae or B. Tuberculosis.

These acids are readily made by condensation of a halogen alkyl cyclohexane with the proper substituted malonic ester, or by condensation of an omega-cyolohexyl-alkyl malonic ester or a cyclohexyl malonic ester with an alkyl halide, then saponification and elimination of carbon dioxide. These are represented in the following series of equations:

coon I malaria-n6 canon ooon' ooon' omucononfiz canon ooon' COONI oanaonmda an'on OOONI OOONa Hu(OHs);6B 2H0! OONa (0001: camera), a 2mm ooon d/Joon camera), a OeHn(OHs) OH(R)OOOE-i-OO:

ooon In the above equations, X represents a Application filed August 8, 1927. Serial No. 211,640.

halogen, 3 represents zero or more, R reprea lene, and R represents an alkyl group.

ithout limiting the invention to any particular procedure, the following examples will serve to illustrate the preferred general method.

One molecular equivalent of bromo-alkylcyclohexane is added to a mixture of one molecular equivalent of an al l-malonic ester, and one molecular equiv ent of sodium ethylate, and refluxed in absolute alcohol until neutral. The alcohol is distilled, water is added, and the cyclohexyl alkyl malonic ester or the cyc'lohexyl-alkyl-alkyl-malonic ester, as the case may be, is separated and purified.

The malonic ester thus produced is treated with alcoholic potash containing four molecular equivalents of potassium hydroxide and refluxed for one to two hours. Upon evaporation of the alcohol, addition of water, then acidification with hydrochloric acid, the malonic acid derivative separates and is readily purified.

The malonic acid derivative thus produced is heated above its melting point and held at that tem erature until no more evolution of carbon 'oxide takes place. The resulting mixture is thenvvacuum distilled.

'By this general procedure, the following examples were made:

0,11 011, plus OOOH Where R is BoilitigApoint MeltgifigB point Bollgigcpoi'nt Ethyl 146 at 2 mm. 114115 132 at 2 mm. n-Propyl 153 at 3 mm. 132133 122 at'2 mm. n-Heptyl 171 at 3 mm. Difficult to 182 at 2 mm.

crystallize Allyl 142 at 2 mm. 9596 125 at 2 mm.

Ewample I II General formula A.-Cyclohexylpropyl alkyl malonic esters General formula acids;

General formula 5 B.--Cyclohexylpropyl alkyl malonic acids; (1 1-1 (CH CH (R) COOH where R15 1301121 01111; meltgl i point Bong 01m Ethyl 149151 at 4 mm. 142-143 146-147" at 2 mm. n-Butyl 160161 at 4 mm. 137-138 153-154: at 2 mm. n-Heptyl 209210 at 5 mm. 98- 99 199-208 at 2 mm. Allyl 17 0-17 2 at 5 mm. 147150 at 2 mm.

Example IV. General formula A.-Oyclohexy1butyl alkyl malonic esters; General formula G IA Z) 4 2 02 G HW ZLW m C.-Cyclohexyl alpha-alkyl hexanoic acids General formula 15 B.Cyelohexylbuty1 alkyl malonic acids; G H (CH CH(R) COOH Where R is Bollgigipoint MeltgpgBpoint Boiligifg cpoint Ethyl 166 at 4 mm. 136 174 at 3 mm. n-Butyl 176 at 4 mm. 113 179 at 4 mm. n-Amyl 192 at 5 mm. 64 208 at 8 mm. Allyl 169 at 4 mm. 143 175 at 6 mm.

in which y represents zero or more, and

R represents an aliphatic hydrocarbon group, and Z represents hydrogen, a metal, or an alkyl group.

2. The process of making a compound of the type described in claim 1, which consists in introducing an alkyl group and a group containing a cyclohexyl radical into malonic ester, followed by saponification and elimination of one molecule of carbon dioxide.

ROGER ADAMS. 

